Question 1

According to VSEPR theory, which of the following counts as a single electron group when determining molecular geometry?

Accepted Answer

A lone pair, a single bond, a double bond, or a triple bond

Question 2

What is the molecular geometry of a molecule with four electron groups around the central atom, two of which are lone pairs?

Accepted Answer

Bent

Question 3

Which of the following statements about bond angles is TRUE according to VSEPR theory?

Accepted Answer

Bond angles decrease as the number of lone pairs on the central atom increases

Question 4

A molecule has five electron groups around its central atom: three bonding pairs and two lone pairs. What is its molecular geometry?

Accepted Answer

T-shaped

Question 5

Which of the following best explains why lone pairs occupy more space than bonding pairs?

Accepted Answer

Lone pairs are localized on the central atom and are not shared between atoms

Question 6

What is the ideal bond angle in a molecule with a tetrahedral electron geometry?

Accepted Answer

$$109.5^\circ$$

Question 7

Which molecule has a trigonal pyramidal molecular geometry?

Accepted Answer

NH$$_3$$

Question 8

If a molecule has six electron groups around the central atom and one is a lone pair, what is its molecular geometry?

Accepted Answer

Square pyramidal

Question 9

Which of the following is the correct order of electron group repulsions from most to least repulsive?

Accepted Answer

Lone pair–lone pair $$\u003e$$ lone pair–bonding pair $$\u003e$$ bonding pair–bonding pair

Question 10

A molecule of water (H$$_2O) $$has which electron geometry and molecular geometry?

Accepted Answer

Electron geometry: tetrahedral; Molecular geometry: bent

Question 11

Which statement is always true according to VSEPR theory?

Accepted Answer

The shape of a molecule is determined by repulsions among all electron groups on the central atom

Question 12

Which of the following molecules has a linear molecular geometry?

Accepted Answer

CO$$_2$$

Question 13

A molecule has three electron groups around the central atom, one of which is a lone pair. What is its molecular geometry?

Accepted Answer

Bent

Question 14

Which of the following best describes the effect of resonance structures on determining electron groups for VSEPR theory?

Accepted Answer

Any one resonance structure can be used to determine the number of electron groups

Question 15

Which molecule would have a seesaw molecular geometry?

Accepted Answer

SF$$_4$$

Question 16

A molecule has six electron groups around the central atom, two of which are lone pairs. What is its molecular geometry?

Accepted Answer

Square planar

Question 17

Which of the following is a real-world example of a molecule with a trigonal planar electron geometry?

Accepted Answer

BF$$_3$$

Question 18

Which factor causes bond angles to deviate from their ideal values in molecules?

Accepted Answer

Presence of lone pairs and multiple bonds

Question 19

In the molecule NH$$_3$$, what is the approximate bond angle?

Accepted Answer

$$107^\circ$$

Question 20

Which of the following molecules has a square planar molecular geometry?

Accepted Answer

XeF$$_4$$

Chemical Bonding II: Molecular Shapes, VSEPR Theory, and Electron Group Repulsions

스터디 가이드 - 연습 문제